This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX5, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40AX5
The AirTAC Airtac SI40 Standard Cylinder SI40AX5 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 5mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX5, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke5 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX5
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI40 Standard Cylinder SI40AX5
The AirTAC SI40AX5 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 5mm stroke. Delivering 628N push at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX5. This direct successor shares the exact ISO 15552 mounting interface, bore, force and accessories. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. Note the -A code specifies a SUS420J2 stainless rod for corrosion resistance, and lacking an -S suffix, this SKU cannot accept a sensor.
The SAI family also introduces lock and valve variants absent in the SI line, including SAIL, SAIF and BSAI models.
Airtac SI40 Standard Cylinder SI40AX5 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX5 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX5 |
| Bore size | Ø40 mm |
| Stroke | 5 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40AX5 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40AX5 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40AX5
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×5 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40AX5 Is Used
Short-Stroke Clamping
Ideal for compact clamping fixtures requiring high force over a 5mm travel, leveraging the 628N push at 0.5MPa.
Corrosive Ejectors
The SUS420J2 stainless rod option suits ejection tasks in damp or mildly corrosive manufacturing environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX5 with the SAI40AX5
To replace the SI40AX5, order the SAI40AX5. Verify the ISO 15552 mounting fixture, 40mm bore, 5mm stroke, G1/4 port (PT/G/NPT thread options) and the SUS420J2 stainless rod (-A). Because this 5mm stroke is nonstandard, confirm cushion effectiveness for such a short travel. Sizing both ways: a neighbouring 32mm bore yields 402N push at 0.5MPa, while a 50mm bore gives 982N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. Without an -S magnet, this cylinder cannot take a CS1-B/DS1-B sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX5
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40AX5 FAQ
Yes, the SI40AX5 is discontinued. The direct replacement is the SAI40AX5. It shares the same ISO 15552 mounting interface, 40mm bore, 5mm stroke, 628N force and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 port. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Request a Quote for the SAI40AX5
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX5 replacement — usually within 7-8 hours.